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    Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.
    A．whyB．howC．unlessD．where
    C。
    由they have eggs or young chicks与they don’t use a nest之间的逻辑关系可以推出该空表示“除非”，因此应填unless引导条件状语从句。
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